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									                     ECE4884 / 4007 Project Summary

Project Title        Thermal Detecting Wireless Sensor Network

Team Members         Joseph Roberson (EE)
(names and majors)   Jessica Curry (EE)
                     Gautam Ankala (EE)

Advisor / Section    Milor / L02

Semester             2008 Fall

Project Abstract     Wireless sensor networks are designed for minimal power consumption, low cost,
(250-300 words)      and small volume. The sensors are small devices equipped with components for
                     sensing, calculating, and wireless transfer. Sensor technology can be used as a
                     means to detect potential environmental issues such as fires and failures in bridges
                     and buildings so the proper individuals can be alerted of the potential problem. The
                     Heat Sensor team will design a wireless sensor network that can be used to detect
                     hazardous thermal activity in buildings and specifically, environmental areas such
                     as wildlife and forests. The sensors will be programmed with an algorithm that
                     enables the design to implement an energy proficient network. This will allow the
                     network to efficiently broadcast collected information from individual sensors and
                     route the data to a personal computer for analysis. Crossbow’s MICAz wireless
                     sensors will be used to take data readings and transfer the data to a computer by use
                     of its wireless capabilities. A prototype network will be designed to show that
                     wireless sensors can detect hazardous temperatures, based on the varying
                     applications, and wirelessly transfer the data to the user of the product.
                     The prototype network will consist of four MICAz sensors for temperature
                     measurements and a personal computer to display the readings. This heat sensor
                     system can be provided for a total cost of $14097.00. Since each sensor has an
                     outdoor range of 75 to 100 meters, each unit will be able to monitor an area up to
                     10,000 square meters. The heat sensing network will provide reliable detection of
                     fires and real-time communication at a low cost to the consumer.
Project Title               Thermal Detecting Wireless Sensor Network

List codes and              Crossbow MICAz is compliant with the IEEE 802.15.4 and ZigBee standards. The
standards that              IEEE 802.15.4 standard is for low data rate networks within a relatively small area.
                            Since the design is a prototype, the network does not require extensive wireless
significantly affect your   coverage, which would require other forms of wireless communication. ZigBee is
project. Briefly describe   also a standard designed for low data rate and low power consumption wireless
how they influenced         networks. However, ZigBee set standards for the network and application layer
your design.                while IEEE 802.15.4 deals primarily with the physical layer. The MICAz operates
                            with an open source operating system called TinyOS, which uses nesC as the
                            programming language. The nesC language is designed especially for wireless
                            embedded sensor networks and features component based architecture to minimize
                            code size.

List at least two           One constraint associated with the MICAz is that it runs on TinyOS, which is an
significant realistic       open source operating system that requires engineers to learn the nesC
                            programming language to be able to control the MICAz. Understanding the
design constraints that     language without the use of publicized resources makes the design process
applied to your project.    significantly more difficult. This required the group to simply the design since no
Briefly describe how        team member had a prior working knowledge of the language. The second
they affected your          constraint is the sensitivity of the MTS400CB weather sensor boards that will be
design.                     used in the network. The light sensors do not require a sufficient amount of energy
                            for detection and might generate false detections. This would limit the
                            functionality of the wireless network in properly detecting thermal activity.

Briefly explain two         The team considered using an alternative wireless sensor. Unlike the MICAz, the
significant trade-offs      Heliomote, which is developed by the research group at University of California,
                            Los Angeles, has built-in sensors as well as the capability to acquire energy from
considered in your          the environment. Such a capability is called energy harvesting and is highly
design, including           effective when incorporated in a wireless network to increase energy efficiency.
options considered and      However, the Heliomotes have built-in functionalities that are difficult or even
the solution chosen.        impossible to modify making this choice unacceptable. Another trade-off the team
                            considered in the design is GPS adaptation of the wireless sensor. This would
                            enable the sensors to be located by position. Being a prototype design and the
                            limitation on time, the team decided to eliminate this component of the wireless
                            network and focus on proper detection and energy efficient algorithms.

Briefly describe the        N/A
computing aspects of
your projects,
specifically identifying
tradeoffs, interfaces,
and/or interactions.

Complete if applicable;
required if team includes
CmpE majors.

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